Here's a confusing one for you guys. 1987 Ford F-150. New Fan Clutch, Thermostat, Upper and lower radiator hoses and water pump. Thermostat checks good. Water pump checks good. Fan cluth and fan, good. Hoses, good. Water circulating. No oil in coolant, no coolant in oil. Still over heating, but not in idle, only on the road. Over heats over a length of 1 block! What's the deal, I am at the end of my rope. <img src="graemlins/pain.gif" border="0" alt="[pain]" />

Is it actually overheating or are you going by the gage or idiot light. If the gage pegs or the light comkes on it might possibly be a sending unit. Does it seem to cool when you turn the heater on or stay the same? Would it be possible that you have an airlock in the system. Just a few suggestions.

The idiot light is disengaged, or should I say that I have yet to replace the sending unit. I did not think that the sending unit could cause the problem, so I have focused on other areas first. It may be relavent to say that the truck has California emissins and required the replacement of the old clutch, which would not attach to the mounts on the new water pump, with a clutch that would. But, the problem existed before these units were ever replaced. I also replaced the rear feeze plug by dropping the transmission. There is no further sign of leakage. Wish I hadn't, because I have to reset the transmission T/V line. You can probably see how this is getting to me at this point. <img src="graemlins/crash.gif" border="0" alt="[crash]" />

When you say running hot. Is it boiling over? Or just running hot.
Also you said your running hot going down the road. You didn't take the air damn off did you? without the air damn not to much air is forced through the radiator.

i have simular problem with my 92f250 so i took out the termostate and it dont do it running down the road now it only does it under stess i.e light loads as my s 10 that has spent more time on a trailer than the road

Burping the radiator is easy if you have a bleeder in the cooling system. But since you probably don't, take the radiator cap off and start it up. Watch for the coolant to flow (t.stat open) and slowly top it off with coolant rev it a few times to stir things up a little (make sure the heater temp control is on full hot). If needed, you can raise the front of the truck up to ensure that the air finds the highest point and escapes through the filler neck. How is the condition of the radiator cap? I have never had problems with the truck model you have as far as air in the cooling system. Feel the cores of the radiator all over (warmed up engine off), for any areas that aren't as warm as the others. This would indicate clogged cores. If it is a single core radiator, I would definately suspect core blockage.

Thanks. I will try the burp and also check for head gasket leaking. I thought that removing the thermostat would lend to overheating, since the coolant doesn't spend enough time out of the block to cool. Maybe I was wrong about that one, huh. Thanks guys, I hope that I can give advice to some of you one day.

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